Good-Cooking - Cream-Filled Cupcakes

Ingredients

• 3 cups all-purpose flour
• 2 cups granulated sugar
• 1/3 cup baking cocoa
• 2 teaspoons baking soda
• 1 teaspoon salt
• 2 eggs
• 1 cup milk
• 1 cup vegetable oil
• 1 cup water
• 1 teaspoon vanilla extract
• 1/4 cup butter or margarine, softened
• 1/4 cup shortening
• 2 cups confectioners' sugar
• 3 tablespoons milk
• Pinch of salt